The infectiously bratty cheerleading of Roberts's triumphal single "Beat of My Drum", confirmed her as the pale and interesting member of Girls Aloud and this effervescent solo debut - on which she's marshalled the talents of Diplo and Metronomy - feels like a victory for dissenting teenage girls the country over. From the weirdness of "I", which she's called her "funeral song" - a narcotised litany of hates and hopes, set over eerie, plodding synths - to her Florence-bothering bellow of "heaaaaaart" on the fearsome "Porcelain Heart", Roberts sounds utterly self-assured.